An LP tank would work; just have to find a compressor that is safe to use with the gas.
Simple electrolysis of water doesn't only produce Hydrogen, but also Oxygen; HHO, also called Browns Gas...
And using the pwm...
I haven't had any better result with the pwm yet. The theory is to find the 'sweet-spot' by means of the right frequency and pulses, where the Hydrogen and oxygen atoms separate more easily, and thus avoid using any catalyst in the water. (Like in the movie: Chain Reaction. ;) ) There are several examples on Yourtube which claims to have made this work... :?
I've built the pwm for this purpose presented on this site: http://www.h2earth.org/main.htm
Though, they're starting to throw the word 'Overunity' around there, so i'm a bit skeptical... ;)
Just remember that HHO gas are very volatile; do not play with it indoors... ;)
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